P1723-LOCK UP / SELECT CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The Transmission Control Module (TCM) monitors the TCC ON/OFF Solenoid Control signal during normal operation. If the TCC ON/OFF Solenoid status does not match the TCM requested ON/OFF status a DTC will set.
- When Monitored:
Ignition on with a system voltage between 9.0 and 16.0 volts.
- Set Condition:
If the TCC ON/OFF Solenoid status does not match the TCM requested ON/OFF status for the period of 200 msec the DTC will set. It takes two consecutive problem identification trips to illuminate the MIL.
| Possible Causes |
| (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE |
| (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT OPEN |
| (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT SHORT TO GROUND |
| TCC ON/OFF SOLENOID |
| TRANSMISSION CONTROL MODULE |
Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
Diagnostic Test
1. CHECK IF THE DTC IS ACTIVEWith the scan tool, read Transmission DTCs.
Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?
Yes
- Go To 2
No
- Go To 6
2. CHECK TO SEE IF THE DTC IS ACTIVE
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Ignition on, engine not running.
With the scan tool actuate the TCC ON/OFF Solenoid.
Using a 12-volt test light connected to ground, check the (T60) TCC ON/OFF Solenoid Control circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Go To 3
No
- Go To 4
3. CHECK THE (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the TCM C1 harness connector.
Ignition on, engine not running.
Measure the voltage of the (T60) TCC ON/OFF Solenoid Control circuit.
Is the voltage above .05 volts?
Yes
- Repair the (T60) TCC ON/OFF Solenoid Control circuit for a short to voltage.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Replace or repair (valve body) the CV Transmission per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
4. CHECK THE (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Measure the resistance of the (T60) TCC ON/OFF Solenoid Control circuit between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (T60) TCC ON/OFF Solenoid Control circuit for an open.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 5
5. CHECK THE (T60) TCC ON/OFF SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (T60) TCC ON/OFF Solenoid Control circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T60) TCC ON/OFF Solenoid Control circuit for a short to ground.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
6. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Test Complete.